Ecology and the Environment Laboratory L2E, (URAC 32, CNRST ERACNERS 06), Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakesh, Morocco.
WHO Collaborating Centre for Leishmaniasis, Parasitology Service, National Center of Microbiology Institute of Health Carlos III, Majadahonda, Madrid, Spain.
Parasit Vectors. 2017 Oct 2;10(1):454. doi: 10.1186/s13071-017-2398-8.
BACKGROUND: Leishmaniasis remains a major public health problem in African nations, including Morocco, where little is known about the vertebrate reservoirs involved in the causal parasites' transmission cycles. The present study investigates the role of rodent species as potential reservoirs of Leishmania spp. in central Morocco, where both L. tropica and L. infantum have been reported. METHODS: Rodents were caught from 22 sites in central Morocco, by using Sherman metal traps, and identified morphologically. For each specimen, genomic DNA was extracted from different tissues using the Speed Tools DNA extraction Kit. Then, samples were PCR-analyzed, targeting the SSU rRNA gene to detect Leishmania spp. DNA, followed by amplification of the internal transcribed spacer 1 (ITS1) and its sequencing to identify the species. RESULTS: A total of 197 rodents belonging to ten species were captured and identified: Rattus rattus (40.61%), Mus musculus (25.38%), Apodemus sylvaticus (8.63%), Mus spretus (7.11%), Meriones shawi (5.58%), Rattus norvegicus (4.57%), Meriones libycus (3.05%), Mastomys erythroleucus (2.03%), Gerbillus campestris (2.03%) and Lemniscomys barbarus (1.01%). Molecular analysis revealed the presence of Leishmania species in 18 specimens: six R. rattus (out of 80 captured; 7.5%), 11 M. musculus (out of 50 captured; 22%), and one R. norvegicus (out of 9 captured; 11.11%). CONCLUSIONS: To the best of our knowledge, L. infantum and L. tropica were identified in rodent species for the first time in Morocco. These findings suggest that rodent species may be involved in L. infantum and L. tropica transmission cycles in this country but that further studies are needed to confirm their role as reservoirs of Leishmania species in Morocco.
背景:利什曼病仍然是非洲国家的一个主要公共卫生问题,包括摩洛哥,在那里,人们对涉及因果寄生虫传播周期的脊椎动物宿主知之甚少。本研究调查了啮齿动物物种在摩洛哥中部作为潜在利什曼原虫病宿主的作用。利什曼原虫在摩洛哥中部既有报道。 方法:用谢尔曼金属陷阱从摩洛哥中部的 22 个地点捕获啮齿动物,并进行形态学鉴定。对于每个标本,使用 Speed Tools DNA 提取试剂盒从不同组织中提取基因组 DNA。然后,使用针对 SSU rRNA 基因的 PCR 分析检测利什曼原虫 spp.DNA,随后扩增内部转录间隔 1(ITS1)并进行测序以鉴定物种。 结果:共捕获并鉴定了 197 只属于 10 个物种的啮齿动物:褐家鼠(40.61%)、小家鼠(25.38%)、黑线姬鼠(8.63%)、小家鼠(7.11%)、沙氏旱獭(5.58%)、挪威鼠(4.57%)、利比亚沙鼠(3.05%)、红尾沙鼠(2.03%)、草原田鼠(2.03%)和荒漠跳鼠(1.01%)。分子分析显示,18 个标本中存在利什曼原虫属:6 只褐家鼠(80 只中捕获;7.5%)、11 只小家鼠(50 只中捕获;22%)和 1 只挪威鼠(9 只中捕获;11.11%)。 结论:据我们所知,这是首次在摩洛哥的啮齿动物物种中发现婴儿利什曼原虫和热带利什曼原虫。这些发现表明,啮齿动物物种可能参与了该国婴儿利什曼原虫和热带利什曼原虫的传播周期,但需要进一步研究来确认它们在摩洛哥作为利什曼原虫物种的储存库的作用。
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